szhem commented on issue #23438: [SPARK-26525][SHUFFLE]Fast release ShuffleBlockFetcherIterator on completion of the iteration URL: https://github.com/apache/spark/pull/23438#issuecomment-458326798 @liupc I believe that this PR is very similar to this already closed one - #23083. At first it added `TaskContext.removeTaskCompletionListener` too, but according to the comments of @advancedxy and @cloud-fan [here](https://github.com/apache/spark/pull/23083/files#r235955118) and [here](https://github.com/apache/spark/pull/23083#issuecomment-441229846) it would be better not to introduce an additional public API.
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